<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
</head>
<body>

<h1>Select an image:</h1>
<a href="smiley.svg">smiley.svg</a>
<br>
<a href="../../images/logo.png">logo.png</a>

<script>
/*globals $*/
/*jslint vars: true*/
$('a').click(function() {'use strict';
	var meta_str;
	var href = this.href;
	var target = window.parent;
	// Convert Non-SVG images to data URL first 
	// (this could also have been done server-side by the library)
	if (this.href.indexOf('.svg') === -1) {

		meta_str = JSON.stringify({
			name: $(this).text(),
			id: href
		});
		target.postMessage(meta_str, '*');

		var img = new Image();
		img.onload = function() {
			var canvas = document.createElement('canvas');
			canvas.width = this.width;
			canvas.height = this.height;
			// load the raster image into the canvas
			canvas.getContext('2d').drawImage(this, 0, 0);
			// retrieve the data: URL
			var dataurl;
			try {
				dataurl = canvas.toDataURL();
			} catch(err) {
				// This fails in Firefox with file:// URLs :(
				alert("Data URL conversion failed: " + err);
				dataurl = "";
			}
			target.postMessage('|' + href + '|' + dataurl, '*');
		};
		img.src = href;
	} else {
		// Send metadata (also indicates file is about to be sent)
		meta_str = JSON.stringify({
			name: $(this).text(),
			id: href
		});
		target.postMessage(meta_str, '*');
		// Do ajax request for image's href value
		$.get(href, function(data) {
			data = '|' + href + '|' + data;
			// This is where the magic happens!
			target.postMessage(data, '*');
			
		}, 'html'); // 'html' is necessary to keep returned data as a string
	}
	return false;
});

</script>
</body>
</html>
